On experimental determination of Poisson’s ratio for rock-like materials using digital image correlation

Koc, Pino (author)

This article compares the two most used strain determination experimental techniques, the strain gauges and the digital image correlation (DIC), which are used here to determine the static Poisson's ratio of rock-like materials under a compressive loading. While the strain gauge technique measures the strains on the small patch of the underlying material on the spot, where the strain gauge is applied, DIC is a novel optical full-field technique that can measure the strains over the entire region of interest of the specimen. The key research question presented in this paper and research significance is to what extent the measurement of Poisson’s ratio is improved by leveraging the richness of the full-field measurements compared to the conventional strain gauge technique. To this purpose, the hypothesis was tested through virtual experiments in which a numerical simulation of a uniaxial compression test with a cylindrical, rock-like sample was created to mimic the strain gauge and DIC measurement techniques, as well as by conducting an actual compression test on a sandstone material. In contrast to conventional strain gauges, novel optical techniques such as stereo DIC proved to be able to capture the macroscopic Poisson coefficient with higher precision, thus reducing the margin of error.

• Language: English
• Keywords: Poisson’s ratio, digital image correlation, strain gauge, rock-like materials, uniaxial compression
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering; FMF - Faculty of Mathematics and Physics
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: Str. 211-222
• Numbering: Vol. 70, no. 5/6
• PID: 20.500.12556/RUL-159947
• UDC: 004.942:539.3:620.1
• ISSN on article: 0039-2480
• DOI: 10.5545/sv-jme.2024.966
• COBISS.SI-ID: 201992451
• Publication date in RUL: 01.08.2024

Record is a part of a journal

• Title: Strojniški vestnik
• Shortened title: Stroj. vestn.
• Publisher: Zveza strojnih inženirjev in tehnikov Slovenije [etc.], = Association of Mechanical Engineers and Technicians of Slovenia [etc.
• ISSN: 0039-2480
• COBISS.SI-ID: 762116

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Title: O eksperimentalnem določanju Poissonovega količnika za kamninam podobne materiale z uporabo korelacije digitalne slike (DIC)
• Keywords: Poissonov količnik, korelacija digitalnih slik, merilni lističi, materiali kot kamnine, enoosni tlačni testi